Materials Literature
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Abstract Tetrameric Co16‐containing heteropolytungstates Na32 [{Co4(OH)3PO4}4 (A‐α‐SiW9O34)4] ·78H2O (I) and Na30.5K1.5 [{Co4(OH)3PO4}4 (A‐α‐GeW9O34)4] ·116H2O (II) are prepared in 17% and 19% yield, resp., by reaction of trilacunary Keggin polyanions [A‐α‐XW9O34]10‐ (X: SiIV, GeIV) with CoCl2 and Na3PO4 in aqueous ba…
INDONESIA: Tanaman Widuri mengandung beberapa golongan senyawa aktif, diantaranya flavonoid, alkaloid, terpenoid dan steroid. Senyawa-senyawa tersebut telah terbukti bermanfaat sebagai antimalaria. Selain itu, daun Calotropis procera berpotensi antimalaria, sehingga diduga akar Calotropis gigantea juga berpotensi seba…
XRPD is a powerful tool for material characterization in general, and for in-situ studies of chemical processes in particular. The use of an intense X-ray source, .i.e. synchrotron X-rays, coupled with fast X-ray detection permits time-resolved diffraction experiments allowing in-situ quantitative phase analysis durin…
Cet ouvrage decrit une recherche ancree en recuperation d’energie par les polymeres electro-actifs. Les tendances recentes a la fois dans l'industrie et au domaine de la recherche ont mis l'accent sur les polymeres electro-actifs pour la conversion d'energie electromecanique. Cet interet s'explique par de nombreux ava…
Comunicacion oral presentada en las 4 Jornadas Ibericas de Fotoquimica celebradas en Lisboa, Portugal entre los dias 29 de junio a 2 de julio de 2014.
We study spectra of surface states in 2D topological insulators (TIs) based on HgTe/(Hg,Cd)Te quantum wells and 3D Bi$_2$Se$_3$-type compounds by constructing a class of feasible time-reversal invariant boundary conditions (BCs) for an effective ${\bf k}{\bf p}$-Hamiltonian and a tight-binding model of the topological…
National audience
O objetivo deste trabalho foi o de avaliar a microestrutura e as propriedades mecânicas de barras extrudadas a quente e forjadas rotativamente a frio de uma liga AA7050. O lingote para as operações de conformação mecânica foi produzido por conformação por spray a partir de sucata proveniente da usinagem de componentes…
Titanium is a metal highly reactive. In contact with part per million of oxygen or water, can make oxide forms TiO, Ti2O3 or TiO2, which is the most common last . These oxides form a continuous and adherent film, giving the large titanium corrosion resistance and excellent biocompatibility . Because of its mechanical…
Cobalt-Mediated Radical Polymerization (CMRP) is one of the most efficient techniques to form sequenced copolymers between monomers of very different reactivities(e.g. vinyl acetate and acrylonitrile). CMRP is used here to synthesize nanogels of vinylic monomers (either vinyl acetate or ionic liquid monomers) using di…
In this work the experimental study on turning of EN24 alloy steel is performed. Experiments are performed under dry, wet and cryogenic cutting conditions using uncoated tungsten carbide tool having standard geometry by varying the spindle speed (RPM) and feed (mm/rev). The experiments are performed to investigate the…
Thin films of nanocrystalline silicon (nc-Si) are very promising as elements of the solar cells (Shan et al, 2000; Cheng et al, 2004), thin-film transistors (Lee, 2005), gas sensors and devices using the one-electron recharge processes (single electronic devices) (Tiwari, 1996). In the case of solar cells, these prosp…
The optical and electrical characteristics of nanosized silicon are determined not only by the size of the particles, but also the composition and structure of their surfaces (Hadj Zoubir et al, 1995; Jia et al, 1997; Kononov et al, 2005; Rybaltovsky, etc. In 2006). As shown in (Delerue et al, 1999; Prusry et al, 2005…
The strong size dependence of the properties of silicon nanoparticles smaller than 5 nm sharply distinguishes them from all other phases of the condensed silicon. If the other phases, for example, a:Si, c-Si or mcSi, can be characterized by well-defined properties averaged over the volume (see Table 2.1), the properti…
In general, nanostructures with relatively small sizes constitute excellent signal transduction elements when dealing with biological analytes or chemical species. The reason for this is the similarity of the order of size between nanostructures and biological analytes and chemical species. The consequence of this iss…
This chapter presents an overview of the growth behavior of zinc oxide (ZnO) nanostructures on the nonconventional substrates such as paper, plastics, and polymer, with special attention to recent developments in ZnO nanostructures growth on paper substrates and their utilization for different applications. Various me…
The Scherrer formula, the Williamson-Hall plot and the Warren-Averbach method are the most misused tools for the quantitative estimation of the “average size” of a nanocrystalline powder from an X-ray diffraction pattern. In fact, it will be shown that, even if mathematically correct, the result of the traditional ana…
Porous silicon (P-Si) became known for the first time in 1956 in a publication by A. Uhlir, in which the material was obtained as a byproduct of photoelectrochemical etching of holes in the plates of crystalline silicon (Uhlir, 1956). Two years later, D. Turner (Turner, 1958) examined in more detail and described P-Si…
As is known from solid state physics (Ashcroft and Mermin, 1979a and 1979b; Davydov, 1976; Kittel, 1978), the solids can be classified according to the nature of electrical conductivity as electrical conductors (usually metals), semiconductors and insulators (dielectrics). Appreciable conductivity is typical of conduc…
A series of nanocomposites composed of poly(propylene carbonate)(PPC) and ZnO nanoparticles (NPs) were synthesized and characterized. Initially, (3-glycidyloxypropyl)trimethoxysilane was used to introduce epoxide groups onto the ZnO surface. Subsequently, the modified ZnO NPs were incorporated in PPC matrices by ring-…